Sewing machine thread-guide



March 27, 1934. A 5 v05 1,952,912

SEWING MACHINE THREAD GUIDE Filed April 23, 1932 2 Sheets-Sheet 1 f 11Hlullllllllfllllllg March 27, 1934. DE VQE 1,952,912

SEWING MACHINE THREAD GUIDE Filed April 23. 1932 2 Sheets-Sheet 2 Z 35 19 1 r WW1 m AIbr6HDeVbe ew KQMVWM Patented Mar. 27, 1934 UNITED STATES SEWING .MACHINE THREAD-GUIDE Albert Harrison De Voe, Westfield, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N; J., a corporationof New Jersey Application April 23, 1932, Serial No. 607,059

8 Claims This invention relates to improvements in thread-guiding devices for sewing machines and has for its object to provide conveniently threaded means of simple construction for directing thread to the stitch-forming mechanism of a sewing machine.

The invention consists in the devices, combinations and arrangement of parts hereinafter described and set forth in the appended claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which Fig. 1 represents a top-plan view of the cloth-or bed-plate of a sewing machine containing the improvement, with the bracket-arm in horizontal section and the usual throat-plate and slide-plates removed. Fig. 2 is a rear side elevation, partly in section, of the bracket-arm standard end of the sewing machine. Fig. 3 represents I a vertical cross-section of the cloth-plate, sub- Cir stantially on the line 33 of Fig. 1. Fig. 4 represents a vertical cross-section of the cloth-plate substantially on the line 44 of Fig. 1, and showing one of the two similar roller thread-guides and parts coacting therewith.

A sewing machine in which the present improvement has been embodied is more fully shown and described in my patent application Serial No. 605,407, filed April 15, 1932,'and reference will be made herein to only such parts thereof as is deemed essential to an understanding of the invention.

Referring to the drawings, the sewing machine has a clothor bed-plate 1 from which rises the usual bracket-arm standard 2 upon which are mounted the looper-thread tension devices 3. The stitch-forming mechanism of the sewing machine includes a pair of thread-carrying loopers 4 and 5, disposed below the upper face of the cloth-plate and which may be actuated in any suitable manner.

The present invention relates more particularly to improved means for directing the looperthreads L and L from the tension-devices 3 to the loopers. To this end, the cloth-plate 1 is provided in its upper surface with a pair of substantially parallel grooves or channels 6 and '7 constituting thread-directing conduits. These guidechannels extend generally lengthwise of the cloth-plate and terminate at one end in a segmental recess 8 provided in said cloth-plate adjacent to the bracket-arm standard 2.

Normally disposed within the cloth-plate recess 8 is a pair of thread-guides 9 and 10, comprising open wire-loops carried by an ear l1 offset from the lower end of an arm 12 of an angle-lever 12,

13. Intermediate its ends, the lever 12, 13 is fixedly secured upon a horizontally disposed fulorum-pin 14, extending transversely of the guidechannels 6, 7 and journaled in a bearing-sleeve 15 which is shorter than the fulcrum-pin and is tions thereof to direct the looper-threads L and L from the tension devices 3 into the guide-channels 6 and 7. The other arm 13 of the anglelever extends away from the standard 2 for convenient manipulation thereof to lift the threadguides 9 and 10 for threading purposes.

The cloth-plate 1 is provided in its upper face with auxiliary thread-guiding channels 19 and 20 which extend in a direction crosswise of the length of the cloth-plate and from the rearward edges of the usual slide-plate-covered openings 21 and 22 into meeting relation with the guide-channels 6 and 7. Disposed below the upper surface of the cloth-plate 1 contiguous to the meeting guide-channels 6, 19, and '7, 20, and in substantially tangential relation to said channels are peripherally grooved thread-guiding rollers 23 and 24 rotatably journaled upon spindles 25 and 26 fixed in and substantially normal to the horizontal plane of the cloth-plate. The channel 6 is somewhat longer than the channel 7, the bottom walls of said channels 6, 7 terminating opposite to the recess 8 in the upper surface of the cloth-plate at a point slightly beyond the rollers 23, 24 and rearward of the loopers 4 and 5.

Fixed by screws 27 and 28 in suitable recesses provided in the upper face of the cloth-plate, adjacent lto the channels 6, '7 at the roller ends thereof, are the shanks 29 and 30 of thread-retaining fingers 31 and 32. The upper ends of the spindles 25, 26 enter apertures in said fingershanks 29, 30, which latter are recessed upon their inner faces to freely receive the threadguiding rollers. The fingers 31, 32 have their under faces inclined upwardly toward the free ends of said fingers, which latter are disposed above and in spaced relation to the ends of the channels 6, '7 and have their free ends bent upwardly slightly above the upper plane of the cloth-plate. The construction described provides for readily passing the threads L, L about the rollers 23, 24 to 2. In a sewing machine, stitch-forming mechanism, means for directing a thread to an element of said stitch-forming mechanism comprising a thread-guiding conduit, a thread-guide disposed at one end of said conduit for directing the thread into the conduit, means for pivotally supporting said thread-guide, and a spring urging said thread-guide to swing about its pivotal support into its position for directing the thread into said conduit.

3. In a sewing machine, a cloth-plate provided with a thread-guiding conduit and with a recess at one end of said conduit, a thread-guide adapted to direct a thread into said conduit, a pivotally supported arm carrying said thread-guide, and a spring yieldingly urging said arm into a position thereof in which'said thread-guide is disposed in said cloth-plate recess.

4. In a sewing machine, a cloth-plate provided in its upper surface with an open-channel conduit and with a recess at one end of said conduit, a bracket-arm rising from said cloth-plate, a thread-guide adapted to direct a thread into said conduit, an arm carrying said thread-guide and pivotally supported upon said bracket-arm, and

a spring yieldingly urging said arm into a position thereof in which said thread-guide is disposed in said cloth-plate recess.

5. In a sewing machine having stitch-forming mechanism including a thread-carrying looper, a cloth-plate provided in its upper surface with an open-channel thread-guiding conduit, and a thread-guiding roller disposed to extend into the channel of said conduit for directing a thread from said conduit to said looper.

, 6. In a sewing machine having stitch-forming mechanism including a thread-carrying looper, a cloth-plate provided in its upper surface with an open-channel thread-guiding conduit, and a thread-guiding roller disposed in tangential relation to said conduit below the upper surface of said cloth-plate for directing a thread from said conduit to the looper.

'7. In a sewing machine, a cloth-plate provided in its upper surface with meeting thread-guiding channels relatively extending in diiierent directions, and a thread-guiding roller journaled upon said cloth-plate at the meeting point of said channels.

8. In a sewing machine, a cloth-plate provided in its upper surface with a thread-guiding channel, a thread-guiding roller disposed contiguous to said channel below the upper surface of said cloth-plate and journaled upon the cloth-plate for rotation about an axis transverse to the plane of the clothplate, and a thread-retaining finger overlying a portion of said channel adjacent to said roller and disposed in spaced relation to the walls of said channel.

ALBERT HARRISON DE VOE. 

